In Active Galaxies, Their Central Engines May Be Temporarily Fed

Multiple Choice

In active galaxies, their central engines may be temporarily fed by:

A) a sudden surge of star formation.
B) a series of supernovae around the core.
C) the sudden collapse of the core into a supermassive black hole.
D) a close encounter with a neighbor galaxy.
E) the fusion of helium into carbon in their cores.